Tool-retainer.



IIl CfGUSTAFSON. T0oL` RETAINER.

APPLICATION FILED AUG.29,`4'I9I6.

Patented Dec. I2, 1916.

3 SHEETS-SHEET I gnou n Ica'I H. c. GUSTAFSON.. rooL RET/Imm APPLICATION FILED AUG.29, I9I6. l :1,207,901. Patented Dec. 12,1916.

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H. @..GUSTAFSON` TOOL RETAINER. APPLICATION FILED `M1619, 1916.

1,207,901. w j Patentedm6121916.f

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UNITED' STATES PATENT OFFICE.v

I'IJ'ALMER C. GUSTAFSON, 0F DENVER, COLORADO, l ASSIG'NOR T0 THE DENVER ROCK DRILL MANUFACTURING COMP-ANY, OF DENVER, COLORADO, A CORFORATION OF DELAWARE.

TOOL-RETAINER.

Spccication of Letters Patent. Patented Dec. 12, 1916 Application led August 29, 1916. Serial No. 117,455.

To all lwhom it may concern:

Be it known that I, HJALMER C. Gus'rarsoN, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Tool-Retainers, of which the following is a spec1cation.

The present invention relates to tool-re 'deranged through long continued use or through the carelessness of the workmen, the mechanism being such that the apparatus may be heldeither with the retainer in its operative' or inoperative position.

In the embodiment disclosed-Figure 1 is a plan view of one embodiment of the invention, Fig. 2 is a front elevation of the same. Fig. 3 is a side elevation. Fig. 4 is a detail longitudinal sectional view on the -line i-Li of Fig. 1. Fig. 5 is a cr0 sectional view on the line 5-5 of Fig. 1.

Fig. 6 is a view similar to Fig. 3, but showing the device in its inoperative position. Fig. 7 is a detail sectional view of a slightly modified form of construction.

Similar reference numerals designate corresponding parts in all the figures of the drawings.l

In the embodiment illustrated, a tool hold,-

` ing member 8 is disclosed, which may be the head of a well known form of hammer drill, said head having a socket to loosely receive the end of a ltool or bit 9, which can be readily introduced or withdrawn therefrom, as is well understood to those skilled in the art, said tool having a flange or collar 10 thereon. The tool holding member 8 is provided with oppositely outstanding ears 11 through which are passed the side bolts 12 for securing the head or tool holding member 8 in place on the apparatus. Mounted on the front ends of the side bolts are heads 13 which are in the form of annular detachable nuts threaded to said bolts, as shown at 14, and having their front ends forked to provide -spaced ears 15. The usual springs 16 are interposed between the heads 13, and the ears 11.

The tool retaining member is mounted on the side bolts, and ,includes a yoke 17 arranged to embrace the tool 9 in advance of the collar 10, said collar being of suflcient size to-abut agiinst the yoke upon the forward movement of' the-.tool 9. The yoke is provided with rearwardly extending divergently arranged slide elements 18 constituting sections of side arms that are slidable upon other sections, said latter sections being in the form of eye bolts 19. The elements or sections 18 terminate in opposite 'eyes 2O slidable upon said bolts 19 and the rear ends of the elements 19 have eyes 21 which are located between the ears 15 and are pivotally Connected thereto by transversely disposed pins 22. These eyes are extended and fit in rounded recesses 21 formed in the rear ends of the eyes 20, the recesses 21a being the 'same width as the eyes and thus preventing the turning of the eyes and consequently the turning of the heads 13. Upon the front ends of the bolts 19 are placed nuts 23 and washers 24. Coiled springs 25 located on the bolts 19, bear against the eyes 20 and frictionally maintain said eyes against the front ends of the bolt heads 13. In order to secure the yoke against accidental swinging movement when in its operative position, as shown in Fig. 3, the ears 15 of the bolt heads 13 are preferably provided with sockets 26 that receive lugs 27 formed on the eyes 20. lith this construction, it Will be noted that the yoke is really provided with extensible side arms which are pivotally mounted upon the heads of the side bolts, and that the extension of these side arms is resisted by the springs 25.

It is believed that the manner of using the device will be obvious. When the tool retaining member is swung to the position shown in Fig. (3, it is out of associated rela.

' will be retained in the tool holding member 8. When the. yoke is in itnoperative position. the lugs 2T thereof engaging in the sockets 2G, will retain the same against accidental swinging movement, and the springs 25 will serve to afford a vielding resistance tothe forward movement of the yoke under the impact of the collar of the tool striking the same.

A slight modification of the structure is 4shown m Fie". 7, wherein o'ne of the side bolts shown and designated 12th This side bolt is provided with a head 13 having spaced ears 15. the end and upper faces 26 of said ears being flat and disposed in angular relation. 'lhe usual spring 1G is interposed between the head 12 and the drill holding member, and an eye bolt 19 is pivotally mounted between the cars '15 by the transverse pin 2;. 'lhe voke 17 has side elements 1S terminating 1n eyes 2W` that are. slidable on the bolts lil, andare yieldingly held againstthe ears 15 by springs l. 'lhese eyes 20 ha ve flat rear faces and eonsequently will be seated eithe against the end or upper faees 2b" of the ears 15 so that the yoke will be positively held in its operative or inoperative position.

Ilaving thus fully described my invention,

what I elaim as new, and desire to secure by Letters latent isz- 1. In apparatus of the character set forth1 the combination with a tool holding member, of securing means therefor, a tool retaining device having a pivotal mounting on the seeur`ng means and'eapable of 4forward movement, and yielding means swinging with the device for resisting the forward movement.

2. In apparatusl of the character set forth, the (.fombination with a tool holding member, of side bolts for securing the same in place,

a swinging tool retaining device having a' ivotal mounting on the side bolts and capable of forward movement under the impaet of a tool striking the same, and yielding means swinging with the device for resisting its forward movement.

3. In apparatus of the character set forth, the combination with a tool holding member, of securing means therefor. and an extensible tool retaining member movably mounted on the securing means.

4. In apparatus of the chai-'aeter set forth, the combination with a tool holding member, of side bolts for securing the same in place, and a swinging tool retaining member com- )rising a yoke. pivotally mounted on .the side volts and extensible longitudinallyr of the tool retained thereby.

ln apparatus of the character set. forth,

ythe combination willi `a tool holding member, 'of side bolts for securing the same4 in the eye bolts bearing against the elements to resist their sliding movements.

T. ln apparatus of the character set forth, the combination with a tool holdmg member,

of side bolts for sei'uring the same in platin,L 80

said bolts having heads. and a tool retaining member pivoted to the heads of said bolts.

S. In apparatus of the charm-ter set forth, the combination with a tool holding member, of side boltsl for securing the same in place, said bolts having heads. eye bolts pivoted to the heads, a tool retaining yoke having side elements slidablc on the e'e bolts. and springs mounted on the eye bofts and bearing against the yoke.

E). In apparatus of the cha raetei set forth, the combination with a tool holding member, of means for yieldingly securing ythe same, a tool retaining device movably mounted on the securing means, and yielding means for permitting the movement of the device on the impact of blows from the tool, said tool retaining means being also movable from and to a. position to engage a.

tool, and said last mentioned yielding means movin therewith.

10. n apparatus of the character set lforth, the combination with a tool holdin member, of securing means therefor, a too retaining device mounted on the securing means to have a swinging movement, and springs located on opposite sides of the mounting.

11. In apparatus of the character set forth, `the combination with a tool holding member, of side bolts therefor having heads, springs interposed between the heads and tool holding member. a lool retaining yoke, means for pivotally mounting the yoke on the heads. and s nines bearin r affainst the,

n L rs yoke to resist its forward movement.

1Q. In apparatus of the character set forth, the combination with a tool receiving member having outstanding ears, o f side bolts passing through the ears and having heads, springs interposed between the heads and ears, a tool retaining yoke, means for pivotally mounting the. tool retainingyoke on the heads. and springs carried by-said means. and bearing against the yoke, for 125 resisting its forward n vement 125. In apparatus of the character set, forth, the combination with a tool holding member, of a seeuring bolt therefor, and a.

tool retaining yoke having a. pivotal mount- 130 ing on the bolt and also Ahaving a bearing at one side thereagainst to maintain said yoke in a predetermined position, and yielding means bearing against the opposite side of the yoke for maintaining the bearing of said yoke against the bolt.

14. In apparatus of the character set forth, the combination with a tool holding member, of a securing lbolt therefor having a head, and a tool retaining yoke having a pivotal mounting on -the bolt and also having a bearing on the head. y

15. In apparatus of the character set forth, the combination with a tool holding member, of a securing bolt therefor having a head, a swinging tool retaining yoke, a mounting for the yoke pivotally mounted on said head, and means for yieldingly maintaining the yoke in engagement with the head.

16. In apparatus of the character set forth, the combination with a tool holding a tool retaining yoke, devices for pivotally mounting the yoke on the heads, said yoke having frietional engagement with the head, and springs carried by the mountings and member, of side bolts therefor having. heads,-

bearing against the yoke to maintain such frictional engagement.

17. In apparatus of the character set forth, the combination with a tool holding member, of a tool retaining member including a pivoted bolt, a tool engaging yoke slidable on the bolt, and means causing an interlocking engagement between the yoke and bolt to prevent their relative rotation onthe longitudinal axis of the bolt.

18.111 apparatus of the character set forth, the combination with a tool-holding member, of a tool retaining member ineluding a pivoted bolt havingfan eye, and a tool engaging yoke slidable on the bolt, said yoke having an opening through which the bolt passes and having a.reeess to receive the eye and prevent the relative rotation of the yoke and bolt on the longitudinal axis of the bolt.

In testimony Wheriof I affix my signature in the presence of two witnesses.

HJ ALMER C.` GU STAFSON.

Witnesses:

EDWARD L. ULDHAM, GUSTAF C. EK. 

